Commit fcb11918 authored by Bjorn Helgaas's avatar Bjorn Helgaas Committed by Jesse Barnes
Browse files

resources: add arch hook for preventing allocation in reserved areas 



This adds arch_remove_reservations(), which an arch can implement if it
needs to protect part of the address space from allocation.

Sometimes that can be done by just putting a region in the resource tree,
but there are cases where that doesn't work well.  For example, x86 BIOS
E820 reservations are not related to devices, so they may overlap part of,
all of, or more than a device resource, so they may not end up at the
correct spot in the resource tree.

Acked-by: default avatarH. Peter Anvin <hpa@zytor.com>
Signed-off-by: default avatarBjorn Helgaas <bjorn.helgaas@hp.com>
Signed-off-by: default avatarJesse Barnes <jbarnes@virtuousgeek.org>
parent c0f5ac54

include/linux/ioport.h

+1 −0
Original line number Diff line number Diff line
@@ -123,6 +123,7 @@ extern void reserve_region_with_split(struct resource *root, 
extern struct resource *insert_resource_conflict(struct resource *parent, struct resource *new);

extern int insert_resource(struct resource *parent, struct resource *new);

extern void insert_resource_expand_to_fit(struct resource *root, struct resource *new);

extern void arch_remove_reservations(struct resource *avail);

extern int allocate_resource(struct resource *root, struct resource *new,

			     resource_size_t size, resource_size_t min,

			     resource_size_t max, resource_size_t align,

kernel/resource.c

+6 −0
Original line number Diff line number Diff line
@@ -357,6 +357,10 @@ int __weak page_is_ram(unsigned long pfn) 
	return walk_system_ram_range(pfn, 1, NULL, __is_ram) == 1;

}



void __weak arch_remove_reservations(struct resource *avail)

{

}



static resource_size_t simple_align_resource(void *data,

					     const struct resource *avail,

					     resource_size_t size,
@@ -394,6 +398,7 @@ static int find_resource(struct resource *root, struct resource *new, 
	struct resource *this = root->child;

	struct resource tmp = *new, avail, alloc;



	tmp.flags = new->flags;

	tmp.start = root->start;

	/*

	 * Skip past an allocated resource that starts at 0, since the assignment
@@ -410,6 +415,7 @@ static int find_resource(struct resource *root, struct resource *new, 
			tmp.end = root->end;



		resource_clip(&tmp, min, max);

		arch_remove_reservations(&tmp);



		/* Check for overflow after ALIGN() */

		avail = *new;

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